eli5 how do those illusion videos work where you close your eyes after staring at a dot and are able to see the picture?
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Fatigue of the optic receptors.
The cones, the optic receptors in your eyes that allow you to see color, they run out of the chemicals they need to send messages to the brain fairly quickly and take a while to stock backup on them.
This after that Pedro pascal video?
It’s called image persistence or image retention, basically the cells in your eyes that pick up light can only switch signals as fast as 1/30 of a second which is why movies look like their moving even though they’re a series of still images. Now then you stare at something for long enough youl get an after image as a part of the image is retained even longer by the cells.
The receptors become fatigued from staring at that color.
Stare at a gray carpet for a while, and things will become blurry and look like somethings crawling all over it.
This is also how the negative illusion works.
You stare at the negative, and your receptors become fatigued to its colors
Then you look at a white space, and you’ll see the inverse of the negative
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